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ManusJustus said:

How about you try to back up your statements that leprachuans on unicorns are possible, or that something similar to 'The Force' gives humans conciousness but keeps it from apes and other animals.

We have a good theory of what gravity is, we just havent discovered the Higgs Boson (or whatever the answer is) yet.  That doesnt mean that we can make up anything we want to be responsible for gravity.  If I find a pool of water under my sink, I use logic to deduct that maybe the pipes have a leak or there is a crack in the sink.  Just because I dont know what the cause is doesnt mean that I can make up fanciful explanations, such an invisible dragon who lives in my house and hides under the sink to relieve himself because that is the only time he becomes visible.

 

http://en.wikipedia.org/wiki/Logical_possibility

"A logically possible proposition is one that can be asserted without implying a logical contradiction."

"So, for example, the false proposition the sky is green is also logically possible, so long as we are able (as we indeed seem to be) to conceive of some logically coherent world in which the sky is green"

"These propositions are also to be contrasted with logically impossible propositions, i.e., propositions which could not possibly be true under any circumstances in any universe because they are formal contradictions. While it is logically possible for the sky to be green, it is not logically possible for a square to be circular in shape."

(Like my example of: 4+4=9 is impossible)

 

"Just because I dont know what the cause is doesnt mean that I can make up fanciful explanations,"

-you can, it's just unlikely. It's still a logical possibility.